Device for Measuring Electrical Current, Voltage and Temperature on an Electrical Conductor Made of Rigid Material

• US 20080246462A1
• Filed: 08/19/2005
• Published: 10/09/2008
• Est. Priority Date: 08/21/2004
• Status: Active Grant

• Current Assignee: ABB Patent GmbH (ABB Limited)
• Original Assignee: ABB Patent GmbH (ABB Limited)
• Inventors: Muller, Klaus-Georg
• Granted Patent: US 8,947,097 B2
• Time in Patent Office: Days
• US Class Current: 324/105
• CPC Class Codes: G01R 15/142 Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
• CPC Class Codes: G01R 15/146 Measuring arrangements for current not covered by other subgroups of G01R15/14, e.g. using current dividers, shunts, or measuring a voltage drop if no voltage isolation is involved G01R1/203 or G01R19/0092
• CPC Class Codes: G01R 15/22 using light-emitting devices, e.g. LED, optocouplers G01R31/31901 takes precedence
• CPC Class Codes: G01R 19/32 Compensating for temperature change

Abstract

A device for measuring electrical current, voltage and temperature in a conductor made of rigid material is disclosed. The conductor is formed from two conductor sections, between which an electrical resistor element is provided that is made of a material having greater resistance than the material of the conductor sections. In the region of the resistor element, a flattened area with a depression is provided, over which a measuring arrangement, through which a portion of the current flowing through the conductor flows, is placed in the manner of a bridge. In the measuring arrangement is arranged in the vicinity of a contact piece by means of which the conductor can be connected in an electrically conducting manner to another conductor such that the heat generated at the contact point is measured.

Claims

1. A device for measuring electrical current, voltage and temperature in a conductor made of rigid material, wherein the conductor is formed from two conductor sections, between which an electrical resistor element is provided that is made of a material having greater resistance than the material of the conductor sections, wherein, in the region of the resistor element, a flattened area with a depression is provided, over which a measuring arrangement, through which a portion of the current flowing through the conductor flows, is placed in the manner of a bridge, and, wherein in the measuring arrangement is arranged in the vicinity of a contact piece by means of which the conductor can be connected in an electrically conducting manner to another conductor such that the heat generated at the contact point is measured.

2. The device as claimed in claim 1, wherein the measuring element is made of manganin.

3. The device as claimed in claim 2, wherein the resistor element is soldered between the conductor sections, and wherein there is a depression in this area, over which the measuring arrangement is placed.

4. The device as claimed in claim 3, wherein the measuring arrangement has a printed circuit board and a measuring circuit.

5. The device as claimed in claim 4, wherein the measuring circuit and a first microprocessor, which pre-processes the signals coming from measuring circuit, are located on the printed circuit board.

6. The device as claimed in claim 5, wherein optocouplers are provided for DC isolation of the first microprocessors and a second microprocessor.

7. The device as claimed in claim 1, wherein the resistor element is soldered between the conductor sections, and wherein there is a depression in this area, over which the measuring arrangement is placed.

8. The device as claimed in claim 1, wherein the measuring arrangement has a printed circuit board and a measuring circuit.

9. The device as claimed in claim 1, wherein the measuring circuit and a first microprocessor, which pre-processes the signals coming from measuring circuit, are located on the printed circuit board.

10. The device as claimed in claim 1, wherein optocouplers are provided for DC isolation of the first microprocessors and a second microprocessor.

11. An electrical low-voltage system comprising the device as claimed in claim 1.